verbs which take the future inf and the pps of πυνθανομαι

Question 1

what sort of verbs take future infinitives?

Answer 1

verbs of hoping, promising, swearing

Question 2

give the principle parts for πυνθανομαι

Answer 2

πυνθανομαι, πευσομαι, επυθομην, πεπυσμαι, —, —